Well, Yoshiki got me interested in Rachmaninoff, and I like Rachmaninoff's other works as well, specifically the Piano Concerto No. 3 and as Hypno has stated, the one which Yoshiki used for his Drum Solo.
As for others...
Vivaldi's Four Seasons is great to listen too, Franz Liszt's Liebestraum and Hungarian Rhapsody are simply delectable. Offenbach, Tales of Hoffmann Barcarolle without the choir is awesome.
And can't forget Bach, Orchestral Suite No. 3 (Air) is very good to sleep to.
As for Tchaikovsky... I love his Nutcracker's ballet, but the rest is...
I never really got into Mozart, Beethoven or Chopin.